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The function writeValue takes an arbitrary value and writes a binary representation of its underlying object graph to the given I/O stream. The function readValue reverses this process, in much the same way that unbox reverses the process performed by box. Here are the implementations of the functions in terms of the .NET binary serializer located in the namespace System.Runtime.Serialization.Formatters.Binary: open System.IO open System.Runtime.Serialization.Formatters.Binary let writeValue outputStream (x: 'a) = let formatter = new BinaryFormatter() formatter.Serialize(outputStream,box x) let readValue inputStream = let formatter = new BinaryFormatter() let res = formatter.Deserialize(inputStream) unbox x Note that box and unbox are used in the implementation, because the Serialize and Deserialize functions accept and return a value of type obj. Here is an example of how to use the functions to write a value of type Microsoft.FSharp.Collections.Map<string,string> to a FileStream and read it back in again:

let httpViaTryFinally(url: string) = let req = System.Net.WebRequest.Create(url) let resp = req.GetResponse() try let stream = resp.GetResponseStream() let reader = new StreamReader(stream) let html = reader.ReadToEnd() html finally resp.Close() In practice, you can use a shorter form to close and dispose of resources, simply by using a use binding instead of a let binding. This closes the response at the end of the scope of the resp variable, a technique that is discussed in full in 8. Here is how the previous function looks using this form: let httpViaUseBinding(url: string) = let req = System.Net.WebRequest.Create(url) use resp = req.GetResponse() let stream = resp.GetResponseStream() let reader = new StreamReader(stream) let html = reader.ReadToEnd() html

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This is especially true when you re doing the sort of investigative work you will be doing while studying the MySQL source code. Keep a logbook of each discovery you make. Write down every epiphany, important design decision, snippets from important paper documents, and even the occasional ah-ha! Over time you will build up a paper record of your findings (a former boss of mine called it her paper brain!) that will prove invaluable for reviews and your own documentation efforts. If you do use a logbook and make journal entries or paste in important document snippets, you will soon discover that logbooks of the journal variety do not lend themselves to being organized well. Most engineers (like me) prefer lined hardbound journals that cannot be reorganized (unless you use lots of scissors and glue). Others prefer loose-leaf logbooks that permit easy reorganization. If you plan to use a hardbound journal, consider building a living index as you go.

open System.IO let addresses = Map.of_list [ "Jeff", "123 Main Street, Redmond, WA 98052"; "Fred", "987 Pine Road, Phila., PA 19116"; "Mary", "PO Box 112233, Palo Alto, CA 94301" ]

F# lets you define new kinds of exception objects that carry data in a conveniently accessible form. For example, here is a declaration of a new class of exceptions and a function that wraps http with a filter that catches particular cases: exception BlockedURL of string let http2 url = if url = "http://www.kaos.org" then raise(BlockedURL(url)) else http url You can extract the information from F# exception values, again using pattern matching: > try raise(BlockedURL("http://www.kaos.org")) with | BlockedURL(url) -> printf "blocked! url = '%s'\n" url;; blocked! url = 'http://www.kaos.org' Exception values are always subtypes of the F# type exn, an abbreviation for the .NET type System.Exception. The declaration exception BlockedURL of string is shorthand for defining a new F# class type BlockedURLException, which is a subtype of System.Exception. Exception types can also be defined explicitly by defining new object types. s 5 and 6 look more closely at object types and subtyping. Table 4-3 summarizes the exception-related language and library constructs.

Tip If your journal pages aren t numbered, take a few minutes and place page numbers on each page.

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